Restoration of Lost Corners by Proportionate Measurement

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Section 2B - Review Exercise

1. Why is three point control used in a resurvey? a. The original corner was not found in the fourth direction. b. The fourth direction was never surveyed. c. Some controlling corners are lost.
2. In this diagram, how is the proportionate N-S location determined? a. One point control b. Two point control c. Single proportion d. Three point control
3. What about the E-W position? a. Single proportion b. Two point control c. One point control d. Three point control
4. Now, using the above diagram for record data and the diagram below for retracement, compute the proportionate lost corner location. -- This four part question is worth 56 pts. Course 1 a. N 0° 34' E 40.332 b. S 0° 25' W 40.356 c. N 0° 45' E 39.974 Course 2 a. N 0° 14' E 40.372 b. S 0° 35' W 40.556 c. N 0° 24' E 39.827 Course 3 a. N 89° 34' W 40.280 b. N 89° 48' W 42.526 c. N 89° 38' W 40.147 Move a. North 0.203 E 0.105 b. North 0.330 E 0.399 c. North 0.0285 E 0.145